JP3029520B2 - Fittings socket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for removably connecting a socket and a plug with a lock ball provided on the socket by operating an operation sleeve.

[0002]

2. Description of the Related Art A number of pipe joints comprising a socket having a lock ball pressed or released by an operating sleeve and a plug having a locking groove for locking or releasing the lock ball have been manufactured and used. The structure of a socket having an operation sleeve and a lock ball is more complicated than that of a plug. Particularly, the structure of a socket having a built-in valve body is more complicated, which greatly affects the cost of a pipe joint.

Conventionally, in a socket of this type of pipe joint, a valve receiving portion fixed to the inner periphery, a valve body which is urged by a spring to abut a valve seat to close a fluid passage when not connected, and a lock. Many of them have a lock ball receiving portion or the like for preventing the ball from protruding from the inner peripheral surface. No. -34023, Japanese Utility Model Publication No. 59-158
No. 30).

[0004]

According to the pipe joint having the above-mentioned structure, there is a problem that the assembling work becomes very troublesome, and this is one of the major factors for cost increase. In view of the above, an object of the present invention is to reduce the cost by improving the assemblability of a socket of a pipe joint.

[0005]

In order to achieve the above object, the present invention forms a valve head having a small-diameter portion and a large-diameter portion formed at the front end of a cylindrical body and an opening closed at the rear end. Then, a spring and a valve receiving portion are inserted and fitted on the outer periphery of the valve body having a through hole formed in the rear cylinder wall and held by a seal ring, and the flange formed on the outer periphery of the valve receiving portion is fixed to a lock ball. The valve body is positioned by being sandwiched between a front cylinder portion having an operation sleeve and a rear cylinder portion.

[0006] A rear end portion of a cylindrical lock ball receiving portion is fitted and fixed inside the large-diameter portion at the front end of the valve body.
An annular groove is formed in the distal end surface of the small diameter portion of the valve body in the axial direction, packing is mounted, and the outer peripheral end surface of the packing is pressed by the rear end surface of the lock ball receiving portion to prevent the packing from coming off. In addition, the lock ball receiving portion and the valve body are kept in a sealed state via the packing.

Further, a protruding portion is formed in the center of the valve head formed at the rear end of the valve body, which protrudes to the middle of the through hole and tapers toward the front end.

[0008]

A small-diameter portion and a large-diameter portion are formed at the tip of the tubular body, a valve head having an opening closed at the rear end, and a through hole formed in the rear tubular wall. Since the spring and the valve receiving portion are inserted and held by the seal ring, the valve body having the lock ball receiving portion, the spring and the valve receiving portion can be integrally treated, and the flange portion formed on the outer periphery of the valve receiving portion. Is sandwiched between a front cylinder portion and a rear cylinder portion having a lock ball operation sleeve so that the valve body is positioned, thereby facilitating assembly.

A rear end portion of a cylindrical lock ball receiving portion is fitted and fixed inside the large-diameter portion at the front end of the valve body.
An annular groove is formed in the distal end surface of the small diameter portion of the valve body in the axial direction, packing is mounted, and the outer peripheral end surface of the packing is pressed by the rear end surface of the lock ball receiving portion to prevent the packing from coming off. In addition, since the lock ball receiving portion and the valve body are in a sealed state via the packing, it is possible to reliably prevent the packing from slipping out and to prevent fluid leakage from between the lock ball receiving portion and the valve body.

[0010] Further, since the valve head formed at the rear end of the valve body has a protruding portion formed at the center of the inside of the cylinder so as to protrude to the middle of the through hole and taper toward the front end side.
Even when flowing from the plug side to the socket side, the fluid is guided to the through hole formed in the cylinder wall of the valve body along the tip side wall of the projection provided at the center of the valve head inside the cylinder, Resistance is reduced and a smooth flow is obtained. For this reason, there is no particular problem even when the fluid is supplied from the plug side.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In the drawings, 1 is a socket body, 2
Reference numeral 3 denotes a front tube portion, and 3 denotes a rear tube portion screwed to the rear end of the front tube portion 2. The front tube portion 2 and the rear tube portion 3 constitute the socket body 1. Reference numeral 4 denotes a fitting hole formed on the front end side of the front cylindrical portion 2, reference numeral 5 denotes a lock ball loosely fitted into the fitting hole 4 so as to be freely retractable, and reference numeral 6 denotes an axially slidable outer periphery of the front cylindrical portion 2. The fitted operation sleeve is configured to move forward to press the lock ball 5, and to retreat and release. Reference numeral 7 denotes a spring for urging the operation sleeve 6 in the forward direction, and reference numeral 8 denotes a stop ring for preventing the operation sleeve 6 from coming off. 9 is a step formed on the inner peripheral surface of the rear part of the front cylinder part 2,
The stepped portion 9 and the front end surface 10 face a front end surface 10 of the rear cylinder portion 3 screwed to the rear end of the front cylinder portion 2, and sandwich a flange formed on the outer periphery of a valve receiving portion described later. I am trying to wear it.

Reference numeral 11 denotes a valve receiving portion formed in a cylindrical shape made of synthetic resin and fixed in the socket body 1. On the outer periphery of the valve receiving portion 11, a step 9 formed on the inner peripheral surface of the front tube portion 2 constituting the socket body 1, and the front tube portion 2
A flange portion 12 is formed which is sandwiched by a distal end surface 10 of a rear cylinder portion 3 screwed to a rear end of the rear cylinder portion. The flange portion 12 is sandwiched between the front cylinder portion 2 and the rear cylinder portion 3 so as to position a valve body to be described later and to seal between the front cylinder portion 2 and the rear cylinder portion 3. I have. Further, on the inner periphery of the valve receiving portion 11, an annular protrusion 13 for a valve seat is formed, with which a valve head of a valve body described later comes in contact with and separates from the valve body, and opens and closes a fluid passage.

Numeral 14 is a valve body formed in a cylindrical shape, and the valve receiving portion 11 is slidably fitted on the outer periphery of the valve body 14. A valve head 15 is formed at the rear end of the valve body 14, and a seal ring 16 is attached to the valve head 15. Further, a through hole 17 is formed in the rear cylinder wall of the valve element 14. When the valve body 14 advances, the seal ring 16 of the valve head 15 contacts the valve seat annular projection 13 of the valve receiving portion 11 to close the fluid passage 18. Is separated from the annular projection 13 for the valve seat and opens the fluid passage 18 through the through hole 17.

Reference numeral 19 denotes a spring which is inserted around the outer periphery of the valve element 14 and is interposed between the valve receiving portion 11 and the valve element 14 so that the valve element 14 is moved toward the distal end with respect to the valve receiving portion 11. It is energizing. Reference numeral 20 denotes a seal ring that holds the valve receiving portion 11 and the valve element 14 and seals between them. A small-diameter portion 21 and a large-diameter portion 22 are formed at the distal end of the valve body 14.
An annular groove 23 is formed on the distal end face of the plug, and a packing 24 for sealing the distal end of the plug is mounted in the annular groove 23. The packing 24 is pressed by an end face of a lock ball receiving portion described later, and is prevented from coming out of the annular groove 23.

Reference numeral 25 denotes a lock ball receiving portion which is slidably fitted in the front cylindrical portion 2 constituting the socket body 1 and prevents the lock ball 5 from projecting to the inner peripheral surface.
A large diameter portion 2 whose rear end is formed at the tip of the valve body 14
2 are fitted. An engagement protrusion 26 is formed on the outer periphery of the rear end of the lock ball receiving portion 25, while the valve body 14
An engagement protrusion 27 is also formed on the inner periphery of the distal end of the large-diameter portion 22 formed at the distal end of the large-diameter portion 22 of the valve body 14. The lock ball receiving portion 25 is resiliently engaged with an engagement protrusion 27 formed on the inner periphery of the distal end of the valve body 14 so as not to come off from the distal end of the valve body 14. Then, the rear end surface 28 of the lock ball receiving portion 25 attached to the large diameter portion 22 at the distal end of the valve body 14 presses the packing 24 mounted on the distal end surface of the small diameter portion 21 of the valve body 14, The packing 24 is prevented from coming out of the annular groove 23. Further, the valve body 14 and the lock ball receiving portion 25 are configured in a sealed state via the packing 24.

An annular ridge 29 is formed on the side surface of the flange portion 12 of the valve receiving portion 11, and an annular groove 30 for engaging with the annular ridge 29 is formed on the distal end surface 10 of the rear cylinder 3. A flange 9 is formed by a step 9 formed on the inner peripheral surface of the front cylinder 2 constituting the socket body 1 and a front end face 10 of the rear cylinder 3 screwed to the rear end of the front cylinder 2. Is clamped, the annular ridge 29 engages with the annular groove 30 due to the tightening force and is deformed.
And the rear cylinder portion 3 is more reliably sealed. Then, in order to prevent the annular ridge 29 from being deformed more than necessary due to the tightening force, the rear end face 33 of the front cylindrical portion 2 is prevented.
The large-diameter stepped portion 34 formed on the outer periphery of the rear cylindrical portion 3 is brought into contact with the large-diameter stepped portion 34 to regulate the tightening force. Reference numeral 31 denotes a plug, and 32 denotes a lock ball locking groove formed on the outer periphery of the plug 31.

Next, the assembly of the above embodiment will be described. First, the packing 24 is mounted on the annular groove 23 of the small diameter portion 21 formed at the tip of the valve body 14, and then the rear end of the holding cylinder 25 is fitted into the large diameter portion 22. As a result, the engagement protrusion 26 formed on the outer periphery of the rear end of the lock ball receiving portion 25 and the engagement protrusion 27 formed on the inner periphery of the distal end of the large-diameter portion 22 elastically engage with each other. The integrity of the valve body 14 and the lock ball receiving portion 25 is maintained. The packing 24 mounted in the annular groove 23 of the small diameter portion 21 is
The lock ball receiving portion 25 fitted into the lock ball receiving portion 25 is pressed by the rear end surface 28 to prevent the lock ball receiving portion 25 from coming out of the annular groove 23.

Next, a seal ring 20 and a spring 19 are mounted on the outer periphery of the valve body 14, and the valve receiving portion 11 is provided on the outer periphery thereof. It is slidably inserted so as to be located on the 15 side. Then, the valve receiving portion 11 is pushed against the elastic force of the spring 19 until the annular projection 13 for the valve seat is positioned inside the valve head 15, and the seal ring 16 is inserted into the circumferential groove 35 of the valve head 15. When the push-in of the valve receiving portion 11 is released after mounting the valve body 14, the valve body 14 is brought into contact with the end 36 of the valve seat annular projection 13 and the valve body 1.
The spring 1 engaged with the end 37 of the large-diameter portion 22 of FIG.
9, the seal ring 16 abuts on the annular projection 13 for the valve seat, and the valve receiving portion 11, the spring 19, the valve body 1
4 are held together.

Thus, the integrated valve receiving portion 1 is formed.
1 and the like are inserted into the front cylinder portion 2 having the lock ball 5 on the distal end side and the operation sleeve 6 fitted on the outer periphery, with the lock ball receiving portion 25 facing forward from the rear side of the front cylinder portion 2. Part 11
The flange portion 12 formed on the outer periphery of the front cylinder portion 2 is brought into contact with the step portion 9 formed on the rear inner peripheral surface of the front cylinder portion 2 and then the front cylinder portion 2 is formed.
When the rear cylinder part 3 is screwed to the rear end of the socket, the flange part 12 is sandwiched between the step part 9 of the front cylinder part 2 and the front end face 10 of the rear cylinder part 3, and the valve receiving part 11 is inserted into the socket body 1. As a result, the valve body 14, the spring 19, and the lock ball receiving portion 25 are also assembled in the socket body 1.

The flange portion 12 formed on the outer periphery of the valve receiving portion 11 sandwiched between the step portion 9 of the front cylinder portion 2 and the distal end surface 10 of the rear cylinder portion 3 has an annular ridge 29 on its side surface. On the other hand, since the annular groove 30 which engages with the annular ridge 29 is formed on the distal end surface 10 of the rear cylindrical portion 3 which comes into contact with this side surface, the step 9 of the front cylindrical portion 2 and the rear cylindrical portion are formed. When the pin 3 is pinched by the distal end face 10, elasticity and plastic deformation caused by tightening due to the material properties of the valve receiving portion 11 made of synthetic resin, and the annular ridge 2
9 and the engagement of the annular groove 30 together seal the space between the front cylinder 2 and the rear cylinder 3. Thus, the socket of the fitting is assembled.

[0021]

As described above, according to the present invention, a valve head having a small-diameter portion and a large-diameter portion formed at the front end of a cylindrical body, and a valve head closing an opening is formed at a rear end. Since the spring and the valve receiving portion are inserted into the outer periphery of the valve body having a through hole formed therein and held by a seal ring, the valve body having the lock ball receiving portion, the spring, and the valve receiving portion can be integrally handled, Then, the flange portion formed on the outer periphery of the valve receiving portion is sandwiched between the front cylinder portion and the rear cylinder portion having the operation sleeve of the lock ball so that the valve body is positioned. The socket can be assembled, the cost can be reduced by improving the assemblability, and the rear end of the cylindrical lock ball receiving portion is fitted and fixed inside the large-diameter portion at the front end of the valve body. And the distal end surface of the small diameter portion of the valve body The packing is mounted by forming an annular groove in the direction, and the outer peripheral end surface of the packing is pressed by the rear end surface of the lock ball receiving portion, thereby preventing the packing from coming off, and connecting the valve to the lock ball receiving portion through the packing. Since the body and the body are sealed, it is possible to reliably prevent the gasket from coming off, to prevent fluid leakage from between the lock ball receiving portion and the valve body, and to further provide a valve formed at the rear end of the valve body. At the center of the inside of the cylinder of the head, there is provided a protruding portion formed so as to protrude to the middle of the through-hole and taper toward the distal end, so that even when flowing from the plug side to the socket side, fluid flows through the valve head. By being guided to the through-hole formed in the cylinder wall of the valve body along the tip side wall of the projection provided at the center of the cylinder inside, the resistance is reduced and a smooth flow is obtained, so that it is also possible from the plug side. fluid There is an effect, such as in particular there is no problem even if the flow.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a plug is connected to the socket shown in FIG. 1;

FIG. 3 is an enlarged view of a portion A in FIG. 1;

[Explanation of symbols]

 2 Front cylinder part 3 Rear cylinder part 5 Lock ball 6 Operation sleeve 11 Valve receiving part 12 Flange part 14 Valve element 19 Spring 20 Seal ring 24 Packing 25 Lock ball receiving part 29 Ring ridge 30 Ring groove

Claims (1)

(57) [Claims] An outer periphery of a valve body in which a small diameter portion and a large diameter portion are formed at a front end of a cylindrical body, a valve head closing an opening is formed at a rear end, and a through hole is formed in a rear cylinder wall. , A spring and a valve receiving portion are inserted and held by a seal ring, and a flange formed on an outer periphery of the valve receiving portion is sandwiched between a front cylindrical portion and a rear cylindrical portion having a lock ball operating sleeve. The valve body is positioned and the rear end of a cylindrical lock ball receiving portion is fitted and fixed inside the large-diameter portion at the front end of the valve body. An annular groove is formed in the distal end surface in the axial direction, packing is mounted, and the outer peripheral end surface of the packing is pressed by the rear end surface of the lock ball receiving portion to prevent the packing from coming off and to lock through the packing. The ball receiving portion and the valve body are sealed, and further, the rear end of the valve body A pipe joint socket provided with a protruding portion formed at the center of the inside of the valve head formed at a center of the through hole so as to protrude to the middle of the through hole and taper toward the distal end.